from __future__ import print_function
from distutils.dir_util import copy_tree

import os
import re
import sys


def get_type(action):
    return action.split("-")[1]


def replace_in_file(filename, pattern, replacement):
    with open(filename, 'r+') as f:
        content = f.read()
        overwritten_content = re.sub(pattern, replacement, content, flags=re.M)
        f.seek(0)
        f.write(overwritten_content)
        f.truncate()


def is_empty_and_create(path, action):
    abspath = os.path.abspath(path)
    if not os.path.exists(abspath):
        os.makedirs(abspath)
    elif not os.path.isdir(abspath):
        print("Your target path is not a directory. Please remove the", os.path.abspath(abspath),
              "or use different target path.")
        sys.exit(4)
    elif len(os.listdir(path)) > 0:
        print("The directory", abspath, "is not empty. To create a", get_type(action),
              "you must empty the directory or choose a different path.")
        sys.exit(3)


def create_project(target_path, name):
    copy_tree(os.path.join(os.environ['IDF_PATH'], "examples", "get-started", "sample_project"), target_path)
    main_folder = os.path.join(target_path, "main")
    os.rename(os.path.join(main_folder, "main.c"), os.path.join(main_folder, ".".join((name, "c"))))
    replace_in_file(os.path.join(main_folder, "CMakeLists.txt"), "main", name)
    replace_in_file(os.path.join(target_path, "CMakeLists.txt"), "main", name)
    os.remove(os.path.join(target_path, "README.md"))

    # after manual removing "Makefile" and "component.mk" from `examples/get-started/sample_project`
    # remove following two lines as well
    os.remove(os.path.join(target_path, "Makefile"))
    os.remove(os.path.join(target_path, "main", "component.mk"))


def create_component(target_path, name):
    copy_tree(os.path.join(os.environ['IDF_PATH'], "tools", "templates", "sample_component"), target_path)
    os.rename(os.path.join(target_path, "main.c"), os.path.join(target_path, ".".join((name, "c"))))
    os.rename(os.path.join(target_path, "include", "main.h"),
              os.path.join(target_path, "include", ".".join((name, "h"))))

    replace_in_file(os.path.join(target_path, ".".join((name, "c"))), "main", name)
    replace_in_file(os.path.join(target_path, "CMakeLists.txt"), "main", name)


def action_extensions(base_actions, project_path):
    def create_new(action, ctx, global_args, **action_args):
        target_path = action_args.get('path') or os.path.join(project_path, action_args['name'])

        is_empty_and_create(target_path, action)

        func_action_map = {"create-project": create_project, "create-component": create_component}
        func_action_map[action](target_path, action_args['name'])

        print("The", get_type(action), "was created in", os.path.abspath(target_path))

        # after the command execution, no other commands are accepted and idf.py terminates
        sys.exit(0)

    return {
        "actions": {
            "create-project": {
                "callback": create_new,
                "short_help": "Create a new project.",
                "help": ("Create a new project with the name NAME specified as argument. "
                         "For example: "
                         "`idf.py create-project new_proj` "
                         "will create a new project in subdirectory called `new_proj` "
                         "of the current working directory. "
                         "For specifying the new project's path, use either the option --path for specifying the "
                         "destination directory, or the global option -C if the project should be created as a "
                         "subdirectory of the specified directory. "
                         "If the target path does not exist it will be created. If the target folder is not empty "
                         "then the operation will fail with return code 3. "
                         "If the target path is not a folder, the script will fail with return code 4. "
                         "After the execution idf.py terminates "
                         "so this operation should be used alone."),
                "arguments": [{"names": ["name"]}],
                "options": [
                    {
                        "names": ["-p", "--path"],
                        "help": ("Set the path for the new project. The project "
                                 "will be created directly in the given folder if it does not contain anything"),
                    },
                ],

            },
            "create-component": {
                "callback": create_new,
                "short_help": "Create a new component.",
                "help": ("Create a new component with the name NAME specified as argument. "
                         "For example: "
                         "`idf.py create-component new_comp` "
                         "will create a new component in subdirectory called `new_comp` "
                         "of the current working directory. "
                         "For specifying the new component's path use the option -C. "
                         "If the target path does not exist then it will be created. "
                         "If the target folder is not empty "
                         "then the operation will fail with return code 3. "
                         "If the target path is not a folder, the script will fail with return code 4. "
                         "After the execution idf.py terminates "
                         "so this operation should be used alone."),
                "arguments": [{"names": ["name"]}],
            }
        }
    }
